Solution:
We are given:
Number of male fishes surveyed by Elena in a river = 350
Number of male fishes with eggs growing inside them = 150
Therefore the number of male fishes without eggs = 350 - 150 = 200
Now the ratio of male fish with egg cells to male fish without egg cells in the river is:

Therefore, the ratio of male fish with egg cells to male fish without egg cells in the river is 
Answer:
3 times
Explanation:
When the dough is folded, it increases by a constant factor. We can model the growth of the thickness using the exponential growth model

Where:
Initial thickness,
= 2mm
Growth factor, r =8%=0.08
We want to find the smallest number of times Soon Yi will have to roll and fold the dough so that the resulting dough is at least 2.5mm.
i.e When 

Therefore, the smallest number of times Soon Yi will have to roll and fold the dough so that the resulting dough is at least 2.5mm thick is 3.
Answer:

Explanation:
Let
x -----> the number of miles
we know that
The total miles multiplied by $4 per mile plus the flat fee of $3 must be less than or equal to a
so
The inequality that represent this situation is

Solve for x
Subtract 3 both sides

Divide by 4 both sides

An equal number of eighth grade students chosen by chance from the athletic teams and school clubs
The value of the bicycle when it was purchased is $200